(19)
(11) EP 1 251 407 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.10.2002 Bulletin 2002/44

(43) Date of publication A2:
23.10.2002 Bulletin 2002/43

(21) Application number: 02005549.7

(22) Date of filing: 11.03.2002
(51) International Patent Classification (IPC)7: G03G 15/00, B65H 7/14
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 12.03.2001 JP 2001068473

(71) Applicant: CANON KABUSHIKI KAISHA
Ohta-ku, Tokyo (JP)

(72) Inventor:
  • Fujii, Takayuki
    Ohta-ku, Tokyo (JP)

(74) Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Patentanwälte Tiedtke-Bühling-Kinne & Partner, Bavariaring 4
80336 München
80336 München (DE)

   


(54) Power control mechanism for photoelectric sensors of an original feeding apparatus


(57) In an original feeding apparatus (100) having sensors for detecting an original by, respectively, a light emitting element and a light receiving element, service life of the sensors is extended and power consumption is reduced.
A first detector (37,40) for detecting presence/absence of a sheet and a second detector (30-36) capable of being electrically switched between a detection possible condition so that the presence/absence of the sheet can be detected and a detection impossible condition so that the presence/absence of the sheet cannot be detected are provided, and the second sensor (30-36) is still switched to the detection impossible condition even when presence of the original can be detected by the first detector (37,40).






Search report